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(No Model.) 4Sheets-Sheet 1. F. M. LEAVITT, A. 0. KITTREDGE & J. WHITE.

BRAOE BENDBR.

No. 417,255. Patented Dec. 17, 1889.

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Ilugraphcr. Washingkm n c {No Model.) 4 Sheets-Sheet 2. F. M. LEAVITT, A. 0. KITTREDGE & J. WHITE.

B'RAOE BENDER.

Patented Dec. 17

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(NoModeL) F. M. LEAVITT, A. 0. KITTREDGE 8v J. WHITE.

' BRAGE BENDER.

No. 417,255. Patented De0. 17, 1889.

. UNITED STATES PATENT OFFICE.

FRANK M. LEAVIT", OF BROOKLYN, ANSON O. KITTREDGE, OF NEW YORK, AND JAMES \VIIITE, OF BROOKLYN, NEWV YORK, ASSIGNORS TO THE VULOAN COMPANY, OF PHILADELPHIA, PENNSYLVANIA.

BRACE-BEN DER.

SPECIFICATION forming part of Letters Patent No. 417,255, dated December 17, 1889.

Application filed February 6, 1889. Serial No. 298.802. (N model.)

.. T0 aZZ whom it may concern.-

Be it known that we, FRANK M. LEAVITT, of Brooklyn, Kings county, New York, AN- SON O. KITTREDGE, of the city, county, and

State of New York, and JAMES WVHITE, of Brooklyn, Kings county, New York, citizens of the United States, have invented certain new and useful Improvements in Brace-Bend ers, fully described and represented in the fol- 1o lowing specification and the accompanying drawings, forming a part of the same.

The object of this invention is to furnish a power-machine adapted to actuate clamps for gripping a bar of metal and to oscillate a bending-dog to bend such bar of metal through any desired arc. The machine is shown provided with an automatic stop-motion and with a treadle for starting the bending mechanism, by which means a bar may be inserted between the clamps and bent by starting the machine to clamp the bar and rotate the (log. The mechanism for rotating the dog is provided with an automatic trip, which is adjustable upon the table and by which the rotation of the dog is arrested at any desired point. By such construction the angle through which the .bar may be bent is readily varied through any desired arc.

The invention consists in the various devices hereinafter set forth and claimed.

In the drawings the clamps and bendingdog are shown projected above the surface of a table to facilitate the application of the the frame of the table to make the entire structure self-contained and portable.

Figure 1 is an end view of the entire machine. Fig. 2 is a vertical section of the table and dogdriver on line 00 0c in Fig. 12. Fig. 3 is a plan of the dog-driver and the pawl-disk. Fig. 4 is an edge view of the same. Fig. 5 is a plan of the bearing for the pawl, enlarged. Figs. 6 and 7 are side and edge views of the pawl. Figs. 8 and 9 are plan and edge views of the trip-lever. Fig. 10 is a side elevation of the entire machine with the driving-wheel and adjacent collar in section. Fig. 11 is a sectional plan of the same on liney 'y in Fig. 10. Fig. 12 is a plan of the table-top, and Fig. 13

is a view of the under side of thesame with the dog-driver. Fig. 14 shows the dog-carrier,

its disk, and the trip-lever and pawl, all de tached from the other parts of the apparatus, and viewed in the direction of the arrow 1) b in Fig. 3. Fig. 15 is a view of the top of the bed (similar to Fig. 12) with the dog J at. the end of its bending movement, and the pawl and dog-driver shown in dotted lines engaged as' they appear just before their dis- 6o engagement by the stud k.

A are legs at each end of the machine supporting the table B and a bed O, to which the gearing is attached. The top of the table B supports the bars to be bent, and the construction is especially adapted for bending to various angles the wrought-iron braces used in cornice-work of all kinds.

a a are fixed and movable jaws projected above the plane of the table to grip the bars (shown by the dotted lines I) in Fig. 12). Vertical bearings I 1 upon the parts B and 0 support a shaft J, rotated by means of suitable gearing, and provided at its lower end with a crank e to actuate the bending-dog. The movable jaw is fitted by a slide a in ways 0', formed in the top of the table, and is actuated to grip the brace by a lever d, provided at one end with a roller (1 and at the opposite end with a screw d to vary the movement of the jaw a. A cam having a concentric face d is fixed upon the top of the shaft J in contact with the roll (1' to actuate the clamp, and a crank e is fixed to the bottom end of such shaft to actuate a toothed segment 6', attached to the lower end of the dog-driver. The bendingdog itself consists in a block f, with right-am gle corner, fixed adj ustably by a bolt f and a slot f to the top of an oscillating carrier g. The carrier has a shank pivoted in a bearing g in the table 13, the shank being provided at its lower end with a disk It, having a pawl pivoted thereon and provided with a triplever j, projected beyond the rim of the disk. 5 The pawl when retracted serves to complete the periphery of the disk, as shown in Fig. 3, and its arbor c is pivoted in a bearing 0 fixed upon the disk, and is provided at its upper end with a trip-lever j, fixed thereon by a square I00 7". The dog-driver consists in a crank-arm m, having an ear m fitted to the rim of the disk and provided with a notch or, to engage the end of the pawl when moved toward the same. A spring a is attached to the triplever j and operates to hold the pawl pressed normally outward into the notch 17,, as shown in Fig. 13, the lever j being then projected in an inclined position at its greatest distance from the rim of the disk. A segmental slot It" is formed in the table over the end of the trip-lever when thus projected, and a tripstud 7c is held adjustably in such slot to intercept the end of the trip-lever at any desired point in the rotation of the disk, to detach the pawl and disk from the driver m. The crank-arm m is movable concentric with the disk, but independently thereof, by a driver spindle m, extended downward through the bed 0, where it is provided with a toothed segment 6 for oscillating it through a fixed are. The stud 7c is held within the slot by the thumb-nut it which is applied to the upper end of the stud in a recess formed parallel with the slot, to admit the nut below the surface of the table. The stud may thus be readily adjusted and secured from the top of the table at any point in the slot, and operates to intercept the trip-lever j and to release the pawl from the driver at the desired point in its movement, as shown in Fig. 3.

The dog f, as shown in Figs. 12 and 14, is turned by the disk through the medium of the carrier 9, and its arc of rotation beingregulated by the adjustment of the trip-stud it is obvious that the angle at which the bar may be bent can be readily and accurately controlled. The bar is shown in dotted lines in Fig. 12, and in full 'lines in Fig. 15, bent atan angle of forty-five degrees, and the dog is shown in dotted lines turned around through an equal arc in contact with the bent portion of the bar.

When the cam-face CZ" is against the roll (Z', the stud-screw (Z may be turned to move the clamp-jaw ct to and, from the jaw a to pinch a bar of any desired thickness, and the corner of the fixed clamp a, against which the bars are bent, is formed with an angle a little less than ninety degrees, as shown in Fig. 12, to compensate for the elasticity of the metal when it is required to bend the bars to an exactly-square corner. The dog f is, like the jaw a, adjustable to and from the fixed jaw a by means of the boltf', fitted in the slotf by which it may be set the required distance from the corner of the jaw a for bendingbars of various thicknesses.

D are bearings upon the table (1, carrying a pulley-shaft E, which is provided at its outer end with driving-pulley F and at its inner end with bevel-pinion G, which meshes with a bevel-wheel H, fitted to turn loosely upon a Vertical driving-shaft J. A clutch-hub J is 'attached to the shaft J below the wheel H and provided with a sliding key Z to engage with a notch in the wheel H when it is desired to actuate the bending apparatus. The keyZ is pressed toward the notch in the wheel H (which is not shown in the drawings) by a spring, which is not illustrated, as its use is well understood, and the clutch is actuated by means already used in power-presses to automatically stop the machine at the end of each revolution. Such means consist in the bent lever Z having a beveled end (shown in Figs. 10 and 11) adapted to engage a head Z, to retract the key Z from the wheel H when the wheel is in a certain position, except the foot of the operator be held upon a treadle T, which is connected with thelever t by a shaft 1, arm Z, and link 25 A spring T holds the treadle normally upward and holds the lever i with its wed ge-shapedpoint adjacent to the shaft J, in the path of the head Z. By this construction the clutch-bolt Z, when the operator depresses the treadle-lever, operates the shaft J, actuating all the parts of the machine through one movement, when the machine automatically stops, unless the foot be kept upon the lever. A toothed segment a, of greater radius than the segment e, is shown pivoted upon the under side of the bed 0 and meshed with the segment 6'. The segment at is oscillated by a link i pivoted to the crank c and segment u.

In Fig. 1 the trip-lever and trip-stud 7c are not visible, as they are obscured by the bear ing g.

Fig. 12 shows the dog and the carrier in readiness to begin a bending-stroke, the rotation of the cam in the direction of the arrow marked thereon operating first to press the jaw a toward the jaw a to pinch the bar, and the bending-dog f being pushed into a suitable position to commence its stroke by inserting the bar from the opposite side through the space between the jaws a and a.

No means have been found necessary in practice to return the bending-dog f to its initial position (shown in Fig. 12) after bending a bar, as the elasticity of the bent portion of the bar operates immediately, when the pawl is detached from the driver m by the stop 7:, to throw the dog back to its initial position. (Shown in Fig. 12.)

In Fig. 13 the parts are shown in readiness to begin a bending-stroke, with the pawl 11 engaged with the notch 71. in the dog-driver m The parts are brought to this relation by the movement of the crank e to its outer position, (shown in Fig. 11,) thus turning the segment 6' to the extreme limit of its stroke, (when moving in a direction contraryto that shown by the arrow 2 in Fig. 13,) and thus causes the spring to throw the pawl into the notch n.

In Fig. 12 the dog f is shown at such preparatory stage of the bending operation.

To operate the machine upon a bar of given thickness to be bent through a given angle, the set-screw d is adjusted with the bar between the jaws a and a and the cam-face (Z turned in contact with the roll (Z'. The rotation of the cam will thus operate to pinch the bar between the fixed and movable jaws prior to the bending operation. The stud It is then adjusted in the slot 70 to detach the pawl from the dog-driver at the given point in the oscillation of the driver, the driver performing the remainder of the stroke that is produced by the crank 6 without carrying the bending-dog along with it.

The machine is operated as follows: The operator depresses the treadle, thus releasing the clutch-bolt Z and permitting it to engage the wheel H, which rotates the shaft J, first actuating the cam 61 to clamp the bar and then bringing the crank e in the position shown in Fig. 11 to commence the oscillation of the dog f. The dog is oscillated by the dog-driver and the pawl 'i until the triplever j encounters the stud 7t and is moved inward by the same, when the movements of the disk It and of the bending-dog f are arrested, and the dog f recoilsfrom the bent bar to the position shown in Fig. 12. The dog-driver m continues its oscillations to the full end of the stroke produced by the crank c after the disengagement of the pawl therefrom, and upon its return-stroke passes over the pawl, pressing it into the rim of the disk into the position shown in Fig. 3, from which it would be pressed outward at the completion of the drivers movement, as shown in Fig. 13, into the notch n by the spring 92', in readiness to propel the driver through another stroke if the operators foot be retained upon the treadle. If the operator desires the machine to make but a single stroke, he withdraws his foot from the treadle as soon as the key Z has engaged the wheel II, and the bent lever then operates automatically to retract the key and stop the machine at the end of one revolution, when the parts are engaged, as shown in Fig. 13, in readiness to commence another bending-stroke. The comple tion of the stroke brings the cam into the position shown in Fig. 12, in which the jaw a may be pressed back from the jaw a, and the bent bar may then be removed from between the jaws to introduce a fresh bar for bending. If desired, a spring 5 may be applied to retract the jaw a-, when permitted by the cam d, as shown in Fig. 2.

' From the above description it will be understood that the dog-driver is operated positively by the shaft on and the crank 6 through a uniform are great enough to move the bending-dog through the maximum angle desired, and that the disk h, by which the driver is connected with the bending-dog, may be detached from the driver at any point in its oscillation by the contact of the trip-lever j with the stud 711, which detaches the pawl i from the notch n in the driver, and thus arrests the movement of the bending-dog.

It is obviously immaterial how the rotary motion of the shaft operates to oscillate the driver-spindle m, as it is common to connect a crank. having a full rotation with a longer crank upon another shaft to oscillate such shaft through the required are, and such construction would obviously be an exact equivalent forthe crank e and the toothed segment 6, which latter, in such case, would be replaced by a crank-arm of suitable length to be operated through the desired are by the rotary crank e. Neither is it essential that the driver should be oscillated, as it would actuate the disk with the same effect if it were continuously rotated in the direction of the arrow as in Fig. 13; but such rotary movement would involve a higher rate of speed for the driver than that effected by oscillating it, as shown herein. It is also obvious that the machine may be operated without a clutch by having fast and loose pulleys applied to the pulley-shaft, as is common in such constructions.

lVe are aware that clam )in 'aws are combined with a bending-jaw in a cornice-brake; and we do not therefore claim such construction, broadly, but only a construction in which the bending jaw or dog is actuated by a driver from which it is detachable by suitable trip mechanism.

It will be understood that one of the chief ad vantages of my invention is the derivation of a greater or less angular movement for the bending-dog from a dog-driver having uniform motion. It is therefore immaterial what means be used to disengage the dogdriver from the dog, provided such means be adjustable, as by the trip-stud 7c and the triplever j. (Shown herein.) Neither is it material whether the pawl be fixed to the disk and engaged with the driver, as shown herein, or the pawl be fixed to the driver and engaged with the disk, as it is obvious that the same device may be used to trip the pawl in either case.

Having thus set forth the invention, what is claimed herein is 1. In abrace-bender, the combination, with the clamping-jaws and the oscillating dog for bending the bars, of an oscillating driver, a pawl connecting the driver and the dog, and means for detaching the pawl to disengage the dog from the driver, as and for the purpose set forth.

2. In a brace-bender, the combination, with the clam ping-j aws and the oscillating dog for bending the bars, of an oscillating driver, a pawl connecting the driver and the dog, a triplever for moving the pawl, and an adjustable trip for actuating the lever, as and for the purpose set forth.

3. In a brace-bender, the combination, with the clamping-jaws, of the disk h, the dog f, driven by the same, the bearing 0 upon the disk, the pawl i, pivoted in the bearing and provided with the lever j, the oscillating driver Tm, adapted to engage the pawl, and the ad justable stud 7t for actuating the pawl-lever and disengaging the pawl from the driver, as and for the purpose set forth.

at. In a brace-bender, the combination, with the fixed jaw a and movable jaw a, of a le ver for actuating the movable jaw, a rotating earn for actuating the lever, the oscillating dog f, fixed upon the carrier g, the disk 72, connected with the carrier, the driver m, actuating the disk through the pawl i and the arm j, and adjustable stud 7; for detaching the pawl from the driver, as and for the purpose set forth.

5. In a brace-bender, the eombination,'with the table B, of the fixed jaw a and movable jaw a, actuated by the lever (Z, the dog and the carrier g and disk It for oscillating the same, the'driver m, provided with notch 71, the pawl 2', arm j, and adjustable stud 7tfor detaching the driver from the dog, and the shaft J, provided with the cam having the concentric face cl, and with the crank e and connections to oscillate the driver m, the Whole arranged and operated as and for the purpose set forth.

6. In a brace-bender, the combination, with our hands in the presence of two subscribing witnesses.

FRANK M. LEAVITT. ANsoN o. KITTREDGE. JAMES WHITE.

\Vitnesses:

DENNIS JUDGE, F. O. B. PAGE. Vitnesses as to James \Vhite:

WM. K. ScHENcK, R. A. LINDSAY. 

